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 #include &lt;QtGui&gt;

 #include &quot;scribblearea.h&quot;

 ScribbleArea::ScribbleArea(QWidget *parent)
     : QWidget(parent)
 {
     setAttribute(Qt::WA_StaticContents);
     modified = false;
     scribbling = false;
     myPenWidth = 1;
     myPenColor = Qt::blue;
 }

 bool ScribbleArea::openImage(const QString &amp;fileName)
 {
     QImage loadedImage;
     if (!loadedImage.load(fileName))
         return false;

     QSize newSize = loadedImage.size().expandedTo(size());
     resizeImage(&amp;loadedImage, newSize);
     image = loadedImage;
     modified = false;
     update();
     return true;
 }

 bool ScribbleArea::saveImage(const QString &amp;fileName, const char *fileFormat)
 {
     QImage visibleImage = image;
     resizeImage(&amp;visibleImage, size());

     if (visibleImage.save(fileName, fileFormat)) {
         modified = false;
         return true;
     } else {
         return false;
     }
 }

 void ScribbleArea::setPenColor(const QColor &amp;newColor)
 {
     myPenColor = newColor;
 }

 void ScribbleArea::setPenWidth(int newWidth)
 {
     myPenWidth = newWidth;
 }

 void ScribbleArea::clearImage()
 {
     image.fill(qRgb(255, 255, 255));
     modified = true;
     update();
 }

 void ScribbleArea::mousePressEvent(QMouseEvent *event)
 {
     if (event-&gt;button() == Qt::LeftButton) {
         lastPoint = event-&gt;pos();
         scribbling = true;
     }
 }

 void ScribbleArea::mouseMoveEvent(QMouseEvent *event)
 {
     if ((event-&gt;buttons() &amp; Qt::LeftButton) &amp;&amp; scribbling)
         drawLineTo(event-&gt;pos());
 }

 void ScribbleArea::mouseReleaseEvent(QMouseEvent *event)
 {
     if (event-&gt;button() == Qt::LeftButton &amp;&amp; scribbling) {
         drawLineTo(event-&gt;pos());
         scribbling = false;
     }
 }

 void ScribbleArea::paintEvent(QPaintEvent * <span class="comment">/* event */</span>)
 {
     QPainter painter(this);
     painter.drawImage(QPoint(0, 0), image);
 }

 void ScribbleArea::resizeEvent(QResizeEvent *event)
 {
     if (width() &gt; image.width() || height() &gt; image.height()) {
         int newWidth = qMax(width() + 128, image.width());
         int newHeight = qMax(height() + 128, image.height());
         resizeImage(&amp;image, QSize(newWidth, newHeight));
         update();
     }
     QWidget::resizeEvent(event);
 }

 void ScribbleArea::drawLineTo(const QPoint &amp;endPoint)
 {
     QPainter painter(&amp;image);
     painter.setPen(QPen(myPenColor, myPenWidth, Qt::SolidLine, Qt::RoundCap,
                         Qt::RoundJoin));
     painter.drawLine(lastPoint, endPoint);
     modified = true;

     int rad = (myPenWidth / 2) + 2;
     update(QRect(lastPoint, endPoint).normalized()
                                      .adjusted(-rad, -rad, +rad, +rad));
     lastPoint = endPoint;
 }

 void ScribbleArea::resizeImage(QImage *image, const QSize &amp;newSize)
 {
     if (image-&gt;size() == newSize)
         return;

     QImage newImage(newSize, QImage::Format_RGB32);
     newImage.fill(qRgb(255, 255, 255));
     QPainter painter(&amp;newImage);
     painter.drawImage(QPoint(0, 0), *image);
     *image = newImage;
 }

 void ScribbleArea::print()
 {
     QPrinter printer(QPrinter::HighResolution);

     QPrintDialog *printDialog = new QPrintDialog(&amp;printer, this);
     if (printDialog-&gt;exec() == QDialog::Accepted) {
         QPainter painter(&amp;printer);
         QRect rect = painter.viewport();
         QSize size = image.size();
         size.scale(rect.size(), Qt::KeepAspectRatio);
         painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
         painter.setWindow(image.rect());
         painter.drawImage(0, 0, image);
     }
 }</pre>
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